Camera optical lens including eight lenses of +−+−−−+− refractive powers

ABSTRACT

The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n8≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n8 denotes a refractive index of the eighth lens. The present disclosure can achieve ultra-thin, wide-angle lenses having a big aperture.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and moreparticularly, to a camera optical lens suitable for handheld terminaldevices such as smart phones or digital cameras and camera devices suchas monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand forminiature camera lens is increasing day by day, but in general thephotosensitive devices of camera lens are nothing more than ChargeCoupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor(CMOS sensor), and as the progress of the semiconductor manufacturingtechnology makes the pixel size of the photosensitive devices becomesmaller, plus the current development trend of electronic productstowards better functions and thinner and smaller dimensions, miniaturecamera lenses with good imaging quality therefore have become amainstream in the market.

In order to obtain better imaging quality, the lens that istraditionally equipped in mobile phone cameras adopts a three-piece orfour-piece lens structure, or even a five-piece or six-piece structure.Also, with the development of technology and the increase of the diversedemands of users, and as the pixel area of photosensitive devices isbecoming smaller and smaller and the requirement of the system on theimaging quality is improving constantly, an eight-piece lens structuregradually appears in lens designs. Although the common eight-piece lenshas good optical performance, its settings on refractive power, lensspacing and lens shape still have some irrationality, which results inthat the lens structure cannot achieve a high optical performance whilesatisfying design requirements for ultra-thin, wide-angle lenses havinga big aperture.

SUMMARY

In view of the problems, the present disclosure aims to provide a cameralens, which can achieve a high imaging performance while satisfyingdesign requirements for ultra-thin, wide-angle lenses having a bigaperture.

In an embodiment, the present disclosure provides a camera optical lens.The camera optical lens includes, from an object side to an image side:a first lens; a second lens; a third lens; a fourth lens; a fifth lens;a sixth lens; a seventh lens; and an eighth lens. The camera opticallens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and1.55≤n8≤1.70, where f denotes a focal length of the camera optical lens;f1 denotes a focal length of the first lens; f2 denotes a focal lengthof the second lens; and n8 denotes a refractive index of the eighthlens.

The present disclosure can achieve ultra-thin, wide-angle lenses havinghigh optical performance and a big aperture, which are especiallysuitable for camera lens assembly of mobile phones and WEB camera lensesformed by CCD, CMOS and other imaging elements for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood withreference to the following drawings. The components in the drawings arenot necessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the present disclosure. Moreover,in the drawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens inaccordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 1 ;

FIG. 3 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 1 ;

FIG. 4 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 1 ;

FIG. 5 is a schematic diagram of a structure of a camera optical lens inaccordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 5 ;

FIG. 7 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 5 ;

FIG. 8 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 5 ;

FIG. 9 is a schematic diagram of a structure of a camera optical lens inaccordance with Embodiment 3 of the present disclosure;

FIG. 10 is a schematic diagram of a longitudinal aberration of thecamera optical lens shown in FIG. 9 ;

FIG. 11 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 9 ; and

FIG. 12 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 9 .

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail withreference to several exemplary embodiments. To make the technicalproblems to be solved, technical solutions and beneficial effects of thepresent disclosure more apparent, the present disclosure is described infurther detail together with the figure and the embodiments. It shouldbe understood the specific embodiments described hereby is only toexplain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1 , the present disclosure provides a camera opticallens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment1 of the present disclosure. The camera optical lens 10 includes 8lenses. Specifically, the camera optical lens 10 includes, from anobject side to an image side, an aperture S1, a first lens L1, a secondlens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixthlens L6, a seventh lens L7, and an eighth lens L8. An optical elementsuch as a glass filter (GF) can be arranged between the eighth lens L8and an image plane Si.

The first lens L1 has a positive refractive power, the second lens L2has a negative refractive power, the third lens L3 has a positiverefractive power, the fourth lens L4 has a negative refractive power,the fifth lens L5 has a negative refractive power, the sixth lens L6 hasa negative refractive power, the seventh lens L7 has a positiverefractive power, and the eighth lens L8 has a negative refractivepower.

Here, a focal length of the camera optical lens 10 is defined as f, anda focal length of the first lens L1 is defined as f1. The camera opticallens 10 should satisfy a condition of 3.50≤f1/f≤6.50. When the conditionis satisfied, a spherical aberration and the field curvature of thesystem can be effectively balanced. As an example, 3.5≤f1/f≤6.46.

A focal length of the second lens L2 is defined as f2, which satisfies acondition of f2≤0. This condition specifies a sign of the focal lengthof the second lens. This leads to the more appropriate distribution ofthe refractive power, thereby achieving a better imaging quality and alower sensitivity.

A refractive index of the eighth lens L8 is defined as n8, whichsatisfies a condition of 1.55≤n8≤1.70. This condition specifies therefractive index of the eighth lens. This facilitates developmenttowards ultra-thin lenses while facilitating correction of aberrations.As an example, 1.56≤n8≤1.69.

A curvature radius of an object side surface of the first lens L1 isdefined as R1, and a curvature radius of an image side surface of thefirst lens L1 is defined as R2. The camera optical lens 10 shouldsatisfy a condition of −22.00≤(R1+R2)/(R1−R2)≤−10.00, which specifies ashape of the first lens. This condition can alleviate the deflection oflight passing through the lens while effectively reducing aberrations.As an example, −21.75≤(R1+R2)/(R1−R2)≤−10.38.

The focal length of the sixth lens L6 is defined as f6. The cameraoptical lens 10 should satisfy a condition of −3.00≤f6/f≤−1.50. Thiscondition can lead to the more appropriate distribution of therefractive power, thereby achieving a better imaging quality and a lowersensitivity. As an example, −2.85≤f6/f≤−1.63.

An on-axis thickness of the first lens L1 is defined as d1, and a totaloptical length from the object side surface of the first lens to animage plane of the camera optical lens along an optic axis is defined asTTL. The camera optical lens 10 should satisfy a condition of0.02≤d1/TTL≤0.07. This condition can facilitate achieving ultra-thinlenses. As an example, 0.03≤d1/TTL≤0.05.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the second lens L2 is defined as f2. The camera opticallens 10 should satisfy a condition of −40.95≤f2/f≤−12.25. This conditioncan facilitate correction aberrations of the optical system bycontrolling a negative refractive power of the second lens L2 within areasonable range. As an example, −25.59≤f2/f≤−15.32.

A curvature radius of an object side surface of the second lens L2 isdefined as R3, and a curvature radius of an image side surface of thesecond lens L2 is defined as R4. The camera optical lens 10 shouldsatisfy a condition of 10.10≤(R3+R4)/(R3−R4)≤33.07, which specifies ashape of the second lens L2. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 16.16≤(R3+R4)/(R3−R4)≤26.46.

An on-axis thickness of the second lens L2 is defined as d3. The cameraoptical lens 10 should satisfy a condition of 0.02≤d3/TTL≤0.07. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.03≤d3/TTL≤0.06.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the third lens L3 is defined as f3. The camera opticallens 10 should satisfy a condition of 0.48≤f3/f≤1.47. This condition canlead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, 0.77≤f3/f≤1.17.

A curvature radius of an object side surface of the third lens L3 isdefined as R5, and a curvature radius of an image side surface of thethird lens L3 is defined as R6. The camera optical lens 10 shouldsatisfy a condition of −0.35≤(R5+R6)/(R5−R6)≤−0.10, which specifies ashape of the third lens. This condition can alleviate the deflection oflight passing through the lens while effectively reducing aberrations.As an example, −0.22≤(R5+R6)/(R5−R6)≤−0.13.

An on-axis thickness of the third lens L3 is defined as d5. The cameraoptical lens 10 should satisfy a condition of 0.05≤d5/TTL≤0.15. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.08≤d5/TTL≤0.12.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the fourth lens L4 is defined as f4. The camera opticallens 10 should satisfy a condition of −6.42≤f4/f≤−1.96, which specifiesa ratio of the focal length of the fourth lens and the focal length ofthe camera optical lens. This condition can facilitate improving theoptical performance of the system. As an example, −4.01≤f4/f≤−2.45.

A curvature radius of an object side surface of the fourth lens L4 isdefined as R7, and a curvature radius of an image side surface of thefourth lens L4 is defined as R8. The camera optical lens 10 shouldsatisfy a condition of 1.43≤(R7+R8)/(R7−R8)≤4.56, which specifies ashape of the fourth lens L4. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 2.28≤(R7+R8)/(R7−R8)≤3.65.

An on-axis thickness of the fourth lens L4 is defined as d7. The cameraoptical lens 10 should satisfy a condition of 0.02≤d7/TTL≤0.06. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.03≤d7/TTL≤0.05.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the fifth lens L5 is defined as f5. The camera opticallens 10 should satisfy a condition of −32.96≤f5/f≤−9.79. This conditioncan effectively make a light angle of the camera optical lens gentle andreduce the tolerance sensitivity. As an example, −20.60≤f5/f≤−12.24.

A curvature radius of an object side surface of the fifth lens L5 isdefined as R9, and a curvature radius of an image side surface of thefifth lens L5 is defined as R10. The camera optical lens 10 shouldsatisfy a condition of 2.39≤(R9+R10)/(R9−R10)≤7.72, which specifies ashape of the fifth lens L5. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 3.82≤(R9+R10)/(R9−R10)≤6.18.

An on-axis thickness of the fifth lens L5 is defined as d9. The cameraoptical lens 10 should satisfy a condition of 0.01≤d9/TTL≤0.05. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.02≤d9/TTL≤0.04.

A curvature radius of an object side surface of the sixth lens L6 isdefined as R11, and a curvature radius of an image side surface of thesixth lens L6 is defined as R12. The camera optical lens 10 shouldsatisfy a condition of 1.69≤(R11+R12)/(R11−R12)≤7.45, which specifies ashape of the sixth lens L6. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 2.70≤(R11+R12)/(R11−R12)≤5.96.

An on-axis thickness of the sixth lens L6 is defined as d1. The cameraoptical lens 10 should satisfy a condition of 0.02≤d11/TTL≤0.09. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.04≤d11/TTL≤0.07.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the seventh lens L7 is defined as f7. The camera opticallens 10 should satisfy a condition of 0.44≤f7/f≤1.43. This condition canlead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, 0.70≤f7/f≤1.14.

A curvature radius of an object side surface of the seventh lens L7 isdefined as R13, and a curvature radius of an image side surface of theseventh lens L7 is defined as R14. The camera optical lens 10 shouldsatisfy a condition of −3.17≤(R13+R14)/(R13−R14)≤−0.87, which specifiesa shape of the seventh lens L7. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, −1.98≤(R13+R14)/(R13−R14)≤−1.09.

An on-axis thickness of the seventh lens L7 is defined as d13. Thecamera optical lens 10 should satisfy a condition of 0.06≤d13/TTL≤0.20.This condition can facilitate achieving ultra-thin lenses. As anexample, 0.10≤d13/TTL≤0.16.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the eighth lens L8 is defined as f8. The camera opticallens 10 should satisfy a condition of −1.56≤f8/f≤−0.48. This conditioncan lead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, −0.97≤f8/f≤−0.60.

A curvature radius of an object side surface of the eighth lens L8 isdefined as R15, and a curvature radius of an image side surface of theeighth lens L8 is defined as R16. The camera optical lens 10 shouldsatisfy a condition of −0.81≤(R15+R16)/(R15−R16)≤−0.24, which specifiesa shape of the eighth lens L8. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, −0.51≤(R15+R16)/(R15−R16)≤−0.30.

An on-axis thickness of the eighth lens L8 is defined as d15. The cameraoptical lens 10 should satisfy a condition of 0.04≤d15/TTL≤0.17. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.07≤d15/TTL≤0.13.

In this embodiment, an image height of the camera optical lens 10 isdefined as IH. The camera optical lens 10 should satisfy a condition ofTTL/IH≤1.44. This condition can facilitate achieving ultra-thin lenses.

In this embodiment, an F number of the camera optical lens 10 is smallerthan or equal to 2.01, thereby leading to a big aperture and highimaging performance.

When the focal length of the camera optical lens 10, the focal lengthsof respective lenses, the refractive index of the seventh lens, theon-axis thicknesses of respective lenses, the TTL, and the curvatureradius of object side surfaces and image side surfaces of respectivelenses satisfy the above conditions, the camera optical lens 10 willhave high optical performance while achieving ultra-thin, wide-anglelenses having a big aperture. The camera optical lens 10 is especiallysuitable for camera lens assembly of mobile phones and WEB camera lensesformed by CCD, CMOS and other imaging elements for high pixels.

In the following, examples will be used to describe the camera opticallens 10 of the present disclosure. The symbols recorded in each examplewill be described as follows. The focal length, on-axis distance,curvature radius, on-axis thickness, inflexion point position, andarrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object sidesurface of the first lens L1 to the image plane of the camera opticallens along the optic axis) in mm.

In an example, inflexion points and/or arrest points can be arranged onthe object side surface and/or image side surface of the lens, so as tosatisfy the demand for the high quality imaging. The description belowcan be referred to for specific implementations.

Table 1 and Table 2 show design data of the camera optical lens 10according to Embodiment 1 of the present disclosure.

TABLE 1 R d nd vd S1 ∞ d0 =  −0.571  R1 3.145 d1 =  0.443 nd1 1.5444 v155.82 R2 3.789 d2 =  0.410 R3 6.889 d3 =  0.480 nd2 1.6449 v2 22.54 R46.239 d4 =  0.076 R5 6.857 d5 =  1.009 nd3 1.5444 v3 55.82 R6 −9.726 d6=  0.099 R7 15.591 d7 =  0.309 nd4 1.6359 v4 23.82 R8 7.503 d8 =  0.821R9 37.197 d9 =  0.267 nd5 1.6153 v5 25.94 R10 24.313 d10 = 0.414 R117.249 d11 = 0.480 nd6 1.6610 v6 20.53 R12 3.938 d12 = 0.431 R13 3.424d13 = 1.310 nd7 1.5661 v7 37.71 R14 25.82 d14 = 1.600 R15 −4.988 d15 =0.858 nd8 1.5661 v8 37.71 R16 11.766 d16 = 0.327 R17 ∞ d17 = 0.210 ndg1.5168 vg 64.17 R18 ∞ d18 = 0.229

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, a central curvature radiusfor a lens;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of the object side surface of the seventh lens L7;

R14: curvature radius of the image side surface of the seventh lens L7;

R15: curvature radius of the object side surface of the eighth lens L8;

R16: curvature radius of the image side surface of the eighth lens L8;

R17: curvature radius of an object side surface of the optical filterGF;

R18: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object side surface ofthe first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image side surface of the first lens L1 tothe object side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image side surface of the second lens L2to the object side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image side surface of the third lens L3 tothe object side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image side surface of the fourth lens L4to the object side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6to the object side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image side surface of the seventh lens L7to the object side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image side surface of the eighth lens L8to the object side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image side surface of the optical filterGF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

nd7: refractive index of d line of the seventh lens L7;

nd8: refractive index of d line of the eighth lens L8;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of respective lens in the cameraoptical lens 10 according to Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10R1 −9.6782E−01 6.4300E−04 7.9013E−04 −1.1265E−03 1.2410E−03 R2−8.7528E−01 −2.2659E−03 −3.0102E−03 3.2699E−03 −2.7233E−03 R3 8.2861E+00−8.9660E−03 −1.2107E−02 1.0400E−02 −5.3095E−03 R4 −1.1047E+01 3.2153E−02−6.7457E−02 6.7608E−02 −4.0655E−02 R5 9.6593E+00 3.0659E−02 −6.7004E−026.3446E−02 −3.5734E−02 R6 5.6841E+00 −8.0189E−03 −1.0762E−03 2.0010E−03−1.2348E−03 R7 2.0227E+01 −3.0644E−03 −2.3698E−03 3.4906E−03 −1.7098E−03R8 7.9403E+00 1.6117E−03 −2.7679E−03 2.1328E−03 −8.5020E−04 R92.3115E+02 1.0639E−02 −1.6873E−02 5.5970E−03 −1.8251E−05 R10 7.4482E+011.8959E−02 −2.1516E−02 7.7830E−03 −1.3191E−03 R11 −1.3680E+02 9.2011E−03−3.8798E−03 7.5715E−04 −1.1485E−04 R12 −3.4748E+01 −1.1597E−024.9981E−03 −1.9221E−03 4.8673E−04 R13 −1.2105E+01 −2.6560E−03 1.0847E−04−1.5107E−04 2.3474E−05 R14 −5.9029E+00 −4.4759E−04 −1.0080E−04−4.4003E−05 4.6643E−06 R15 −5.3842E−01 −1.1078E−02 1.3878E−03−9.8134E−05 9.3648E−06 R16 2.6637E+00 −7.5602E−03 2.6326E−04 1.2089E−05−2.1422E−06 Aspherical surface coefficients A12 A14 A16 A18 A20 R1−7.9483E−04 2.9310E−04 −6.2802E−05 7.4101E−06 −3.9112E−07 R2 1.6561E−03−6.5286E−04 1.5439E−04 −1.9282E−05 9.2823E−07 R3 1.6924E−03 −2.8298E−043.1509E−06 6.7523E−06 −7.7360E−07 R4 1.5807E−02 −4.0324E−03 6.5858E−04−6.3356E−05 2.7817E−06 R5 1.2187E−02 −2.4617E−03 2.5839E−04 −7.9509E−06−4.6510E−07 R6 4.7995E−04 −1.3317E−04 2.4708E−05 −2.7495E−06 1.3408E−07R7 4.5531E−04 −5.8887E−05 4.5882E−07 7.2948E−07 −5.8198E−08 R81.3559E−04 1.3630E−05 −8.9153E−06 1.3110E−06 −6.8925E−08 R9 −7.4031E−042.9770E−04 −5.7876E−05 5.7924E−06 −2.3683E−07 R10 −8.3756E−05 8.6534E−05−1.7485E−05 1.6189E−06 −5.8357E−08 R11 1.7072E−05 −3.4217E−06 5.0482E−07−3.8533E−08 1.1539E−09 R12 −8.2672E−05 9.0332E−06 −6.0435E−07 2.2459E−08−3.5216E−10 R13 −2.6612E−06 2.0155E−07 −7.8116E−09 9.7800E−11 1.5930E−12R14 −7.5524E−08 −9.2152E−09 4.9660E−10 −8.9172E−12 5.5187E−14 R15−7.5755E−07 3.6774E−08 −1.0114E−09 1.4844E−11 −9.2607E−14 R16 1.2860E−07−4.4650E−09 9.2690E−11 −1.0442E−12 4.7329E−15

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, A12, A14,A16, A18 and A20 are aspheric surface coefficients.

IH: Image Heighty=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰+A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

In the present embodiment, an aspheric surface of each lens surface usesthe aspheric surfaces shown in the above condition (1). However, thepresent disclosure is not limited to the aspherical polynomials formshown in the condition (1).

Table 3 and Table 4 show design data of inflexion points and arrestpoints of respective lens in the camera optical lens 10 according toEmbodiment 1 of the present disclosure. P1R1 and P1R2 represent theobject side surface and the image side surface of the first lens L1,respectively, P2R1 and P2R2 represent the object side surface and theimage side surface of the second lens L2, respectively, P3R1 and P3R2represent the object side surface and the image side surface of thethird lens L3, respectively, P4R1 and P4R2 represent the object sidesurface and the image side surface of the fourth lens L4, respectively,P5R1 and P5R2 represent the object side surface and the image sidesurface of the fifth lens L5, respectively, P6R1 and P6R2 represent theobject side surface and the image side surface of the sixth lens L6,respectively, P7R1 and P7R2 represent the object side surface and theimage side surface of the seventh lens L7, respectively, and P8R1 andP8R2 represent the object side surface and the image side surface of theeighth lens L8, respectively. The data in the column named “inflexionpoint position” refers to vertical distances from inflexion pointsarranged on each lens surface to the optic axis of the camera opticallens 10. The data in the column named “arrest point position” refers tovertical distances from arrest points arranged on each lens surface tothe optic axis of the camera optical lens 10.

TABLE 3 Number of Inflexion Inflexion Inflexion inflexion point pointpoint points position 1 position 2 position 3 P1R1 1 1.885 P1R2 1 1.855P2R1 3 1.055 1.515 1.915 P2R2 0 P3R1 2 1.505 1.975 P3R2 0 P4R1 1 2.145P4R2 1 2.165 P5R1 2 0.735 2.335 P5R2 2 0.875 2.355 P6R1 1 1.335 P6R2 20.905 3.215 P7R1 2 1.295 3.435 P7R2 2 1.435 4.355 P8R1 1 2.785 P8R2 21.045 5.685

TABLE 4 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.095 P5R2 1 1.325 P6R11 2.105 P6R2 1 2.055 P7R1 1 2.315 P7R2 1 2.155 P8R1 0 P8R2 1 1.935

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and450 nm after passing the camera optical lens 10 according toEmbodiment 1. FIG. 4 illustrates a field curvature and a distortion oflight with a wavelength of 546 nm after passing the camera optical lens10 according to Embodiment 1, in which a field curvature S is a fieldcurvature in a sagittal direction and T is a field curvature in atangential direction.

Table 13 below further lists various values of Embodiments 1, 2, and 3and values corresponding to parameters which are specified in the aboveconditions.

As shown in Table 13, Embodiment 1 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera opticallens is 3.881 mm. The image height of 1.0H is 7.00 mm. The FOV (field ofview) is 83.20°. Thus, the camera optical lens can achieve ultra-thin,wide-angle lenses while having on-axis and off-axis aberrationssufficiently corrected, thereby leading to better opticalcharacteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbolshaving the same meanings as Embodiment 1, and only differencestherebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 inEmbodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0 =  −0.493  R1 3.269 d1 =  0.375 nd1 1.5444 v155.82 R2 3.760 d2 =  0.374 R3 6.893 d3 =  0.436 nd2 1.6449 v2 22.54 R46.248 d4 =  0.076 R5 6.850 d5 =  0.985 nd3 1.5444 v3 55.82 R6 −9.477 d6=  0.080 R7 15.275 d7 =  0.358 nd4 1.6359 v4 23.82 R8 7.528 d8 =  0.835R9 37.051 d9 =  0.334 nd5 1.6153 v5 25.94 R10 25.000 d10 = 0.421 R116.165 d11 = 0.525 nd6 1.6610 v6 20.53 R12 3.901 d12 = 0.496 R13 3.355d13 = 1.268 nd7 1.5661 v7 37.71 R14 18.247 d14 = 1.639 R15 −5.246 d15 =1.024 nd8 1.6400 v8 23.54 R16 11.897 d16 = 0.264 R17 ∞ d17 = 0.210 ndg1.5168 vg 64.17 R18 ∞ d18 = 0.168

Table 6 shows aspheric surface data of respective lenses in the cameraoptical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10R1 −1.1585E+00 −2.7109E−06 6.8417E−04 −1.1518E−03 1.2364E−03 R2−1.0202E+00 −2.6391E−03 −3.0890E−03 3.2691E−03 −2.7225E−03 R3 8.0629E+00−8.8993E−03 −1.2116E−02 1.0418E−02 −5.3078E−03 R4 −1.1448E+01 3.1858E−02−6.7516E−02 6.7597E−02 −4.0659E−02 R5 9.5632E+00 3.0691E−02 −6.7066E−026.3439E−02 −3.5734E−02 R6 6.0340E+00 −8.1417E−03 −1.0294E−03 2.0121E−03−1.2328E−03 R7 1.4189E+01 −3.8349E−03 −2.3426E−03 3.5014E−03 −1.7088E−03R8 8.0712E+00 3.5087E−04 −2.8350E−03 2.1343E−03 −8.5012E−04 R92.2877E+02 1.1056E−02 −1.6939E−02 5.5871E−03 −1.9581E−05 R10 7.5128E+011.8604E−02 −2.1523E−02 7.7730E−03 −1.3202E−03 R11 −7.1477E+01 1.0044E−02−3.8390E−03 7.6068E−04 −1.1439E−04 R12 −2.7789E+01 −1.0873E−025.0967E−03 −1.9156E−03 4.8693E−04 R13 −1.0202E+01 −2.0997E−03 1.3477E−04−1.4738E−04 2.3683E−05 R14 −6.1116E+01 −6.7177E−05 −7.1928E−05−4.6106E−05 4.5850E−06 R15 −3.7177E−01 −1.1331E−02 1.3680E−03−9.8408E−05 9.3647E−06 R16 2.7237E+00 −7.5204E−03 2.6161E−04 1.2074E−05−2.1398E−06 Asphencal surface coefficients A12 A14 A16 A18 A20 R1−7.9557E−04 2.9300E−04 −6.2831E−05 7.4022E−06 −3.9388E−07 R2 1.6565E−03−6.5281E−04 1.5434E−04 −1.9313E−05 9.1510E−07 R3 1.6929E−03 −2.8268E−043.2273E−06 6.7471E−06 −7.8894E−07 R4 1.5806E−02 −4.0324E−03 6.5860E−04−6.3347E−05 2.7854E−06 R5 1.2188E−02 −2.4616E−03 2.5841E−04 −7.9451E−06−4.6307E−07 R6 4.8041E−04 −1.3311E−04 2.4707E−05 −2.7519E−06 1.3323E−07R7 4.5545E−04 −5.8897E−05 4.5277E−07 7.2907E−07 −5.7866E−08 R81.3563E−04 1.3632E−05 −8.9153E−06 1.3111E−06 −6.8819E−08 R9 −7.4037E−042.9771E−04 −5.7871E−05 5.7935E−06 −2.3672E−07 R10 −8.3838E−05 8.6539E−05−1.7483E−05 1.6193E−06 −5.8338E−08 R11 1.7114E−05 −3.4214E−06 5.0454E−07−3.8576E−08 1.1482E−09 R12 −8.2673E−05 9.0329E−06 −6.0441E−07 2.2450E−08−3.5350E−10 R13 −2.6533E−06 2.0184E−07 −7.8285E−09 9.3608E−11 1.0562E−12R14 −7.6596E−08 −9.1836E−09 4.9898E−10 −8.8325E−12 5.8570E−14 R15−7.5731E−07 3.6790E−08 −1.0107E−09 1.4863E−11 −9.2850E−14 R16 1.2866E−07−4.4638E−09 9.2697E−11 −1.0449E−12 4.6805E−15

Table 7 and Table 8 show design data of inflexion points and arrestpoints of respective lens in the camera optical lens 20 according toEmbodiment 2 of the present disclosure.

TABLE 7 Number of Inflexion Inflexion Inflexion inflexion point pointpoint points position 1 position 2 position 3 P1R1 1 1.755 P1R2 1 1.745P2R1 3 1.055 1.475 1.855 P2R2 0 P3R1 2 1.505 1.955 P3R2 0 P4R1 1 2.175P4R2 1 2.155 P5R1 2 0.745 2.315 P5R2 2 0.855 2.365 P6R1 1 1.505 P6R2 21.045 3.375 P7R1 2 1.395 3.555 P7R2 2 1.505 4.375 P8R1 1 2.945 P8R2 21.045 5.895

TABLE 8 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0P2R1 0 P2R2 0 P3R1 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.105 P5R2 1 1.295 P6R1 12.345 P6R2 1 2.465 P7R1 1 2.475 P7R2 1 2.315 P8R1 0 P8R2 1 1.935

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and450 nm after passing the camera optical lens 20 according to Embodiment2. FIG. 8 illustrates afield curvature and a distortion of light with awavelength of 546 nm after passing the camera optical lens 20 accordingto Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera opticallens is 3.797 mm. The image height of 1.0H is 7.0 mm. The FOV (field ofview) is 84.600. Thus, the camera optical lens can achieve ultra-thin,wide-angle lenses while having on-axis and off-axis aberrationssufficiently corrected, thereby leading to better opticalcharacteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbolshaving the same meanings as Embodiment 1, and only differencestherebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 inEmbodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0 =  −0.468  R1 3.275 d1 =  0.347 nd1 1.5444 v155.82 R2 3.594 d2 =  0.357 R3 6.811 d3 =  0.437 nd2 1.6449 v2 22.54 R46.220 d4 =  0.076 R5 6.843 d5 =  0.972 nd3 1.5444 v3 55.82 R6 −9.341 d6=  0.080 R7 15.021 d7 =  0.427 nd4 1.6359 v4 23.82 R8 7.581 d8 =  0.824R9 37.223 d9 =  0.342 nd5 1.6153 v5 25.94 R10 24.638 d10 = 0.414 R116.160 d11 = 0.571 nd6 1.6610 v6 20.53 R12 4.096 d12 = 0.535 R13 3.319d13 = 1.272 nd7 1.5661 v7 37.71 R14 14.708 d14 = 1.649 R15 −5.625 d15 =1.126 nd8 1.6700 v8 19.39 R16 11.957 d16 = 0.245 R15 ∞ d17 = 0.210 ndg1.5168 vg 64.17 R16 ∞ d18 = 0.149

Table 10 shows aspheric surface data of respective lenses in the cameraoptical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Asphencal surface coefficients k A4 A6 A8 A10R1 −1.3928E+00 −6.5068E−04 6.2624E−04 −1.1609E−03 1.2348E−03 R2−1.3759E+00 −3.3847E−03 −3.1195E−03 3.2642E−03 −2.7218E−03 R3 7.9754E+00−8.9189E−03 −1.2212E−02 1.0427E−02 −5.3048E−03 R4 −1.1304E+01 3.1912E−02−6.7517E−02 6.7591E−02 −4.0660E−02 R5 9.5438E+00 3.0387E−02 −6.7066E−026.3443E−02 −3.5733E−02 R6 5.1815E+00 −7.9920E−03 −9.9076E−04 2.0180E−03−1.2319E−03 R7 1.6075E+01 −3.9767E−03 −2.3097E−03 3.5065E−03 −1.7090E−03R8 8.0329E+00 −2.0391E−04 −2.8363E−03 2.1307E−03 −8.5069E−04 R92.2694E+02 1.1518E−02 −1.7028E−02 5.5775E−03 −2.0538E−05 R10 8.2389E+011.8549E−02 −2.1562E−02 7.7640E−03 −1.3210E−03 R11 −6.3960E+01 1.0063E−02−3.8380E−03 7.6505E−04 −1.1446E−04 R12 −2.8226E+01 −1.0960E−025.1230E−03 −1.9145E−03 4.8700E−04 R13 −9.4244E+00 −2.1208E−03 1.5596E−04−1.4655E−04 2.3704E−05 R14 −5.5708E+01 −3.2796E−04 −5.9603E−05−4.6208E−05 4.5622E−06 R15 −2.2357E−01 −1.1619E−02 1.3525E−03−9.8794E−05 9.3597E−06 R16 2.7276E+00 −7.4785E−03 2.6267E−04 1.2094E−05−2.1400E−06 Asphencal surface coefficients A12 A14 A16 A18 A20 R1−7.9593E−04 2.9289E−04 −6.2850E−05 7.4004E−06 −3.9310E−07 R2 1.6569E−03−6.5268E−04 1.5434E−04 −1.9334E−05 9.0525E−07 R3 1.6936E−03 −2.8251E−043.2490E−06 6.7356E−06 −8.0028E−07 R4 1.5806E−02 −4.0325E−03 6.5861E−04−6.3344E−05 2.7861E−06 R5 1.2188E−02 −2.4616E−03 2.5840E−04 −7.9451E−06−4.6272E−07 R6 4.8058E−04 −1.3310E−04 2.4708E−05 −2.7531E−06 1.3279E−07R7 4.5527E−04 −5.8938E−05 4.4943E−07 7.2968E−07 −5.7452E−08 R81.3564E−04 1.3644E−05 −8.9136E−06 1.3114E−06 −6.8772E−08 R9 −7.4041E−042.9772E−04 −5.7868E−05 5.7939E−06 −2.3664E−07 R10 −8.3865E−05 8.6540E−05−1.7482E−05 1.6194E−06 −5.8304E−08 R11 1.7108E−05 −3.4190E−06 5.0486E−07−3.8562E−08 1.1448E−09 R12 −8.2669E−05 9.0331E−06 −6.0441E−07 2.2448E−08−3.5378E−10 R13 −2.6528E−06 2.0184E−07 −7.8308E−09 9.3268E−11 1.0166E−12R14 −7.7475E−08 −9.1982E−09 4.9944E−10 −8.7665E−12 6.3436E−14 R15−7.5718E−07 3.6804E−08 −1.0100E−09 1.4896E−11 −9.1395E−14 R16 1.2864E−07−4.4643E−09 9.2691E−11 −1.0448E−12 4.6941E−15

Table 11 and Table 12 show design data of inflexion points and arrestpoints of respective lens in the camera optical lens 30 according toEmbodiment 3 of the present disclosure.

TABLE 11 Number of Inflexion Inflexion Inflexion inflexion point pointpoint points position 1 position 2 position 3 P1R1 1 1.695 P1R2 1 1.695P2R1 3 1.065 1.445 1.815 P2R2 0 P3R1 2 1.495 1.955 P3R2 0 P4R1 1 2.205P4R2 1 2.125 P5R1 2 0.745 2.315 P5R2 2 0.865 2.355 P6R1 1 1.535 P6R2 21.055 3.385 P7R1 2 1.425 3.535 P7R2 2 1.485 4.315 P8R1 3 3.295 3.5353.925 P8R2 2 1.045 5.925

TABLE 12 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.115 P5R2 1 1.295 P6R11 2.395 P6R2 1 2.555 P7R1 1 2.535 P7R2 1 2.335 P8R1 0 P8R2 1 1.935

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and450 nm after passing the camera optical lens 30 according to Embodiment3. FIG. 12 illustrates field curvature and distortion of light with awavelength of 546 nm after passing the camera optical lens 30 accordingto Embodiment 3.

Table 13 below further lists various values of the present embodimentand values corresponding to parameters which are specified in the aboveconditions. Obviously, the camera optical lens according to thisembodiment satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera opticallens is 3.797 mm. The image height of 1.0H is 7.0 mm. The FOV (field ofview) is 84.50°. Thus, the camera optical lens can achieve ultra-thin,wide-angle lenses while having on-axis and off-axis aberrationssufficiently corrected, thereby leading to better opticalcharacteristics.

TABLE 13 Parameters and Conditions Embodiment 1 Embodiment 2 Embodiment3 f1/f 3.51 4.75 6.42 f2 −143.28 −139.58 −155.50 n8 1.57 1.64 1.67 f7.762 7.594 7.595 f1 27.231 36.063 48.758 f3 7.518 7.431 7.381 f4−22.864 −23.537 −24.377 f5 −113.962 −125.132 −118.603 f6 −13.692 −17.518−20.563 f7 6.785 7.000 7.230 f8 −6.037 −5.503 −5.499 f12 31.938 46.10066.958 Fno 2.00 2.00 2.00

Fno denotes an F number of the camera optical lens.

It can be appreciated by one having ordinary skill in the art that thedescription above is only embodiments of the present disclosure. Inpractice, one having ordinary skill in the art can make variousmodifications to these embodiments in forms and details withoutdeparting from the spirit and scope of the present disclosure.

What is claimed is:
 1. A camera optical lens, comprising, from an objectside to an image side: a first lens; a second lens; a third lens; afourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighthlens, wherein the camera optical lens satisfies following conditions:3.50≤f1/f≤6.50; f2≤0; and 1.55≤n8≤1.70, −40.95≤f2/f≤−12.25;10.10≤(R3+R4)/(R3−R4)≤33.07; 0.02≤d3/TTL≤0.07, where f denotes a focallength of the camera optical lens; f1 denotes a focal length of thefirst lens; f2 denotes a focal length of the second lens; and n8 denotesa refractive index of the eighth lens; R3 denotes a curvature radius ofan object side surface of the second lens; R4 denotes a curvature radiusof an image side surface of the second lens; d3 denotes an on-axisthickness of the second lens; TTL denotes a total optical length from anobject side surface of the first lens to an image plane of the cameraoptical lens along an optic axis.
 2. The camera optical lens asdescribed in claim 1, further satisfying a following condition:−22.00≤(R1+R2)/(R1−R2)≤−10.00, where R1 denotes a curvature radius of anobject side surface of the first lens; and R2 denotes a curvature radiusof an image side surface of the first lens.
 3. The camera optical lensas described in claim 1, further satisfying a following condition:−3.00≤f6/f≤−1.50, where f6 denotes a focal length of the sixth lens. 4.The camera optical lens as described in claim 1, further satisfying afollowing condition: 0.02≤d1/TTL≤0.07, where d1 denotes an on-axisthickness of the first lens.
 5. The camera optical lens as described inclaim 1, further satisfying following conditions: 0.48≤f3/f≤1.47;−0.35≤(R5+R6)/(R5−R6)≤−0.10; and 0.05≤d5/TTL≤0.15, where f3 denotes afocal length of the third lens; R5 denotes a curvature radius of anobject side surface of the third lens; R6 denotes a curvature radius ofan image side surface of the third lens; d5 denotes an on-axis thicknessof the third lens.
 6. The camera optical lens as described in claim 1,further satisfying following conditions: −6.42≤f4/f≤−1.96;1.43≤(R7+R8)/(R7-R8)≤4.56; and 0.02≤d7/TTL≤0.06, where f4 denotes afocal length of the fourth lens; R7 denotes a curvature radius of anobject side surface of the fourth lens; R8 denotes a curvature radius ofan image side surface of the fourth lens; d7 denotes an on-axisthickness of the fourth lens.
 7. The camera optical lens as described inclaim 1, further satisfying following conditions: −32.96≤f5/f≤−9.79;2.39≤(R9+R10)/(R9−R10)≤7.72; and 0.01≤d9/TTL≤0.05, where f5 denotes afocal length of the fifth lens; R9 denotes a curvature radius of anobject side surface of the fifth lens; R10 denotes a curvature radius ofan image side surface of the fifth lens; d9 denotes an on-axis thicknessof the fifth lens.
 8. The camera optical lens as described in claim 1,further satisfying following conditions: 1.69≤(R11+R12)/(R11−R12)≤7.45;and 0.02≤d11/TTL≤0.09, where R11 denotes a curvature radius of an objectside surface of the sixth lens; R12 denotes a curvature radius of animage side surface of the sixth lens; d11 denotes an on-axis thicknessof the sixth lens.
 9. The camera optical lens as described in claim 1,further satisfying following conditions: 0.44≤f7/f≤1.43;−3.17≤(R13+R14)/(R13−R14)≤−0.87; and 0.06≤d13/TTL≤0.20, where f7 denotesa focal length of the seventh lens; R13 denotes a curvature radius of anobject side surface of the seventh lens; R14 denotes a curvature radiusof an image side surface of the seventh lens; d13 denotes an on-axisthickness of the seventh lens.
 10. The camera optical lens as describedin claim 1, further satisfying following conditions: −1.56≤f8/f≤−0.48;−0.81≤(R15+R16)/(R15−R16)≤−0.24; and 0.04≤d15/TTL≤0.17, where f8 denotesa focal length of the eighth lens; R15 denotes a curvature radius of anobject side surface of the eighth lens; R16 denotes a curvature radiusof an image side surface of the eighth lens; d15 denotes an on-axisthickness of the eighth lens.